EP 1028438 A1 20000816 - METHOD OF MANUFACTURING R-Fe-B BOND MAGNETS OF HIGH CORROSION RESISTANCE
Title (en)
METHOD OF MANUFACTURING R-Fe-B BOND MAGNETS OF HIGH CORROSION RESISTANCE
Title (de)
HERSTELLUNGSVERFAHREN VON R-FE-B VERBUNDMAGNETEN MIT HÖHE KORROSIONSWIDERSTAND
Title (fr)
PROCEDE DE FABRICATION D'AIMANTS A LIAISON R-FE-B PRESENTANT UNE HAUTE RESISTANCE A LA CORROSION
Publication
Application
Priority
- JP 9804718 W 19981019
- JP 31643697 A 19971030
Abstract (en)
A method of manufacturing R-Fe-B bonded magnets, capable of forming various corrosion resisting films on a R-Fe-B bonded magnet uniformly with a very high bonded strength so as to attain such a very high corrosion resistance thereof that prevents the bonded magnet from being rusted even in a long-period high-temperature high-humidity test; comprising barrel-polishing a porous R-Fe-B bonded magnet by a dry method using as media an abrasive stone formed by sintering inorganic powder of Al2O3, SiC, ZrO and MgO, or a mixture of an abrasive for metal balls and vegetable media, such as vegetable skin chips, sawdust, rind of a fruit and a core of corn, or a mixture of vegetable media the surfaces of which are modified by the above-mentioned abrasive and the above-mentioned inorganic pulverized bodies, so as to enable a surface of the magnet to be smoothed and sealed; or immersing a magnet material in a neutral or alkali bath so as to enable a layer of electroless plating to be formed thereon; or subjecting a magnet material to electrolytic plating so as to enable a film of markedly high bonded strength and dimensional accuracy to be formed thereon, whereby an object R-Fe-B bonded magnet of a high dimensional accuracy and a high corrosion resistance is obtained.
IPC 1-7
IPC 8 full level
B24B 31/14 (2006.01); H01F 41/02 (2006.01)
CPC (source: EP KR US)
B24B 31/14 (2013.01 - EP US); H01F 41/02 (2013.01 - KR); H01F 41/026 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 1028438 A1 20000816; EP 1028438 A4 20010117; EP 1028438 B1 20050420; CN 1148764 C 20040505; CN 1278358 A 20001227; DE 69829872 D1 20050525; DE 69829872 T2 20050922; KR 100371786 B1 20030212; KR 20010031589 A 20010416; US 6365030 B1 20020402; WO 9923676 A1 19990514
DOCDB simple family (application)
EP 98947935 A 19981019; CN 98810776 A 19981019; DE 69829872 T 19981019; JP 9804718 W 19981019; KR 20007004639 A 20000428; US 53045200 A 20000510